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Is there any reason not to use the lugnuts from my steel wheels with my summer alloys? The only reason I can think of is length. How much "grab" should lug nuts have - ie. how much of the threaded portion of the nuts should extend out backside of the wheel?

Compare the thickness of the 2 wheels if they are the same (not close) then yes. Otherwise they won't properly secure the wheels. Use a torque wrench (88 lb ft) and a little anti seize compound on the mating surfaces.